I am friends with one of the shop foreman here at one of the bmw's here in edmonton. (20 years of experience) With that being said, his words exactly " The engine oil that is used can definitely handle the 15k interval change. But the filter can't. When we service some vehicles the Oil filter is completely destroyed crumple or enough oil already leaking, obviously this is not told to the costumer. So if you really want to take care of your vehicle and make sure is top shape. Do it every 7500km, whats an extra $100 for your peace of mind later on and on a 50k vehicle. Also will help your resale value later on if you do decide to do it as it will be documented."
Im planning to do it every 5000km since i am anal about maintenance. If you don't want to to take it to the dealership than buy the stuff and do it yourself. Only reason to take it to dealership is that it is recorded into the system and youll have it as records for resale later and it just looks nice to have them from the dealership. Where as if you were to do it yourself, you'd have receipts. So is just preference and diff price range.
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